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fs: use scoped_with_init_fs() for kernel_read_file_from_path_initns()

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Replace the manual init_task root retrieval with scoped_with_init_fs()
to temporarily override current->fs. This allows using the simpler
filp_open() instead of the init_root() + file_open_root() pattern.

kernel_read_file_from_path_initns() ← fw_get_filesystem_firmware() ←
_request_firmware() ← request_firmware_work_func() ← kworker (async
firmware loading)

Also called synchronously from request_firmware() which can be user or
kthread context.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-12-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-06-29 10:44:09 +02:00
parent fea1107ff3
commit 2a868a445b
1 changed files with 2 additions and 7 deletions
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fs/kernel_read_file.c
+2 -7
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@@ -150,18 +150,13 @@ ssize_t kernel_read_file_from_path_initns(const char *path, loff_t offset,
enum kernel_read_file_id id)
{
struct file *file;
struct path root;
ssize_t ret;
if (!path || !*path)
return -EINVAL;
task_lock(&init_task);
get_fs_root(init_task.fs, &root);
task_unlock(&init_task);
file = file_open_root(&root, path, O_RDONLY, 0);
path_put(&root);
scoped_with_init_fs()
file = filp_open(path, O_RDONLY, 0);
if (IS_ERR(file))
return PTR_ERR(file);